|2008 Joint Meeting of The Geological Society of America, Soil Science Society of America, American Society of Agronomy, Crop Science Society of America, Gulf Coast Association of Geological Societies with the Gulf Coast Section of SEPM|
|Paper No. 156-5|
|Presentation Time: 8:00 AM-4:45 PM|
Near-Infrared Reflectance Spectroscopy for the Analysis of Mortar In the House of the Vestals, Pompeii, Italy
WEHBY, Jennifer1, SWANSON, Samuel E.1, and DVORACEK, Douglas2, (1) Geology, University of Georgia, 210 Field Street, Athens, GA 30602-2501, firstname.lastname@example.org, (2) Center for Applied Isotope Studies, University of Georgia, Athens, GA 30602|
The ruins of Pompeii, having been so well preserved, allow a unique opportunity to study architectural styles, techniques and materials on a large scale. Traditional geochemical analysis is inherently destructive, and collecting samples of construction mortar, no matter how small, will irreparably damage the walls. This study aims to test a method of portable analysis that can be used to analyze the mortar in situ, eliminating the need for destructive sample collection.
To establish a known compositional profile, samples were collected from the House of the Vestals, a large, elite house in Pompeii, Italy. X-ray fluorescence (WD-XRF by borate fusion method) analyses revealed the mortar was a mixture of lime-based cement (~18% CaO) and reddish volcanic sand containing ~36% SiO2, ~15% Al2O3, ~4% MgO, ~4.8% Fe2O3, ~3.5% K2O, and ~2.1% Na2O. Thin section analysis and X-ray diffraction of selected samples revealed the lime was composed of calcite and vaterite, and the volcanic material contained well-formed clinopyroxene, plagioclase and olivine crystals.
Field analysis techniques included imaging with a portable microscope and short wave infrared reflectance spectrometry (SWIR) with the FieldSpec 3 spectroradiometer. The short wavelength range is useful for analyzing and identifying carbonates, making this equipment ideal for the material under study here. Portable SWIR initially provides qualitative mineralogical data, but these can be quantified to determine chemical composition as well. In order to compare the initial results to those obtainable with the portable equipment, the portable technique was tested both in the field on the in tact mortar and in the lab on collected samples.
2008 Joint Meeting of The Geological Society of America, Soil Science Society of America, American Society of Agronomy, Crop Science Society of America, Gulf Coast Association of Geological Societies with the Gulf Coast Section of SEPM
General Information for this Meeting
|Session No. 156--Booth# 293|
Real-Time, In-Field Geochemical Analysis: Current Capabilities and Future Prospects (Posters)
George R. Brown Convention Center: Exhibit Hall E
8:00 AM-4:45 PM, Sunday, 5 October 2008
Geological Society of America Abstracts with Programs, Vol. 40, No. 6, p. 175
© Copyright 2008 The Geological Society of America (GSA), all rights reserved. Permission is hereby granted to the author(s) of this abstract to reproduce and distribute it freely, for noncommercial purposes. Permission is hereby granted to any individual scientist to download a single copy of this electronic file and reproduce up to 20 paper copies for noncommercial purposes advancing science and education, including classroom use, providing all reproductions include the complete content shown here, including the author information. All other forms of reproduction and/or transmittal are prohibited without written permission from GSA Copyright Permissions.